Direct measurement of the top quark mass by the DØ collaboration

Abbott, B. ; Mondal, N. K. ; et., al (1998) Direct measurement of the top quark mass by the DØ collaboration Physical Review D - Particles, Fields, Gravitation and Cosmology, 58 (5). 052001_1-052001_39. ISSN 1550-7998

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Official URL: http://prd.aps.org/abstract/PRD/v58/i5/e052001

Related URL: http://dx.doi.org/10.1103/PhysRevD.58.052001

Abstract

We determine the top quark mass mt using tt̅ pairs produced in the DØ detector by √s=1.8TeV pp̅ collisions in a 125pb-1 exposure at the Fermilab Tevatron. We make a two constraint fit to mt in tt̅ →bW+b̅ W- final states with one W boson decaying to qq̅ and the other to eν or µν. Likelihood fits to the data yield mt(l+jets)=173.3±5.6 (stat) ± 5.5 (syst) GeV/c2. When this result is combined with an analysis of events in which both W bosons decay into leptons, we obtain mt=172.1±5.2 (stat)±4.9 (syst) GeV/c2. An alternate analysis, using three constraint fits to fixed top quark masses, gives mt(l+jets)=176.0±7.9 (stat)±4.8 (syst) GeV/c2, consistent with the above result. Studies of kinematic distributions of the top quark candidates are also presented. 14.65.Ha, 13.85.Ni, 13.85.Qk.

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